I think I scared him when I said I didn't hit my patients anymore.

[She laughed because she found the fact she potentially intimidated a boy to be hilarious. Even if it was one who had a hurt ankle and needed her help not her teasing.]

He should be able to walk there and back just fine. I'll keep him safe.

[The grin on her face said she may or may not have every intention of teasing him further. Newt was someone she viewed as being her own age and felt more comfortable teasing and playing around with him than anyone else there.]